BlogGuidesBy Hannah Reid6 November 2026

Can You Filter Hot Water From The Tap, And What Should You Filter Instead?

No, you should not run hot or boiling water through the Flowpure stainless steel tap filter, because it is designed for water below 40°C. Filter the cold water you want to drink or cook with, then heat the filtered water afterwards in a kettle or pan. For drinking, the Drinking Water Inspectorate, the public body for England and Wales, advises ideally using a tap connected to the mains supply, so the cold kitchen tap is usually the sensible place to begin.

Contents: Hot water and temperature limits; choosing a cold tap; boiling tap questions; what the stainless steel filter does; cartridge care.

Can You Put Hot Water Through A Tap Filter?

The Flowpure stainless steel tap filter must be used with water below 40°C, so water from the hot tap should not pass through it. The practical answer is to separate the two jobs: filter at the cold tap, then heat only the amount you need. In my opinion, that order also suits taste, because chlorine and sediment are dealt with before the water reaches the kettle, so the kettle heats water that already tastes cleaner.

A jug filter or a different tap filter may have its own limit, so read the stated operating temperature for that particular product before putting warm water through it. Do not apply the Flowpure stainless steel tap filter's 40°C limit to another device, or another device's limit to the Flowpure filter. I think a clear written temperature is worth more than a broad promise, because the useful question is whether a filter is being used within its own instructions.

Which Cold Tap Should You Filter Instead?

Choose the cold tap that is connected to the mains for drinking and food preparation. The Drinking Water Inspectorate says that in older homes the kitchen cold tap may be the only tap fed from the mains, while newer homes, especially those with unvented heating, often have all hot and cold taps on mains pressure. It also says you can check whether a tap is tank fed by covering the outlet with your thumb with the tap fully open: if you can hold back all the water, it is likely tank fed.

Water from a storage tank is not a problem in itself. The Drinking Water Inspectorate says stored water is safe if the tank is properly designed, correctly installed and kept in good condition, and that stored water deteriorates if the tank has no lid or the water becomes warm. Even so, it says ideally you should only use a mains connected tap for drinking, food preparation or teeth cleaning. Safe is not the same as clean, which is why I would filter at that mains tap.

What Should You Ask Before Buying A Filtered Boiling Tap?

Ask the maker of any filtered boiling tap exactly which outlet is filtered, because a description such as filtered boiling water does not tell you. Ask whether the normal hot outlet is filtered too, which replacement cartridge the exact model needs, how long it lasts and what it costs. Request written confirmation of compatibility rather than assuming cartridges are interchangeable, and ask for the delivery temperature and safety features in writing before you pay.

If you live in a hard water area, ask the supplier what an anti scale cartridge is documented to do. The Flowpure stainless steel tap filter is a filter and does not soften water, so I would keep limescale decisions separate from the choice of a tap filter for taste. A boiling tap is a different purchase from a tap filter, and the Flowpure stainless steel tap filter stays on the cold water side of the kitchen, below 40°C.

What Does The Flowpure Stainless Steel Tap Filter Do?

The Flowpure stainless steel tap filter has a 304 stainless steel body, five thread adapters and a 0.1 micron filtration specification. It reduces chlorine, VOCs and unpleasant tastes and odours, and it blocks sediment, rust and visible particles. The 0.1 micron figure is a specification, not a measured removal result. Independent laboratories have tested the filter, and their reports are at the bottom of the product page.

The stainless steel model also targets lead and trace metals, but test first. If lead or trace metals concern you, have your water tested and ask your water company about testing support. Check the tap outlet and adapter against the fitting instructions, and use a qualified plumber for any plumbing work.

Product At A Glance: Flowpure stainless steel tap filter. 304 stainless steel body, five thread adapters, 0.1 micron specification. Use below 40°C.

How Should You Plan Cartridge Care?

Replace the Flowpure stainless steel tap filter cartridge at about 1,200 litres or up to three months, whichever comes first. The running cost is under 2p a litre, so a replacement cartridge belongs in the budget from the start. A written fitting date beside the basin is the cheapest way to keep the plan honest, because taste alone is a poor reminder.

I think the Flowpure stainless steel tap filter is a good purchase for a household that wants better tasting and cleaner smelling water every day. Fit it on the mains cold tap, keep hot water away from it, heat the filtered water you need, and write the cartridge date down on the day you fit it.

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